has_many通過在Rails中返回多個關聯的對象4

我通過Rails中的關聯有has_many問題。有型號：has_many通過在Rails中返回多個關聯的對象4

class Interval < ActiveRecord::Base 
belongs_to :training 

has_many :termins 
has_many :users, through: :termins 
end 

class User < ActiveRecord::Base 

belongs_to :role 
has_many :termins 
has_many :intervals, through: :termins 
end 

class Termin < ActiveRecord::Base 
belongs_to :interval 
belongs_to :user 
end

所以，我已經創建了一個間隔爲一個用戶，並創建了幾個termins：

Interval.first #=> <Interval id: 6, from: "2014-10-17", to: "2014-11-17", training_id: 1, created_at: "2014-10-16 22:39:38", updated_at: "2014-10-16 22:39:38"> 

Interval.first.termins 
[ 
    #<Termin id: 9, interval_id: 6, user_id: 4, term: "2014-10-16", created_at: "2014-10-16 22:42:15", updated_at: "2014-10-16 22:42:15">, 
    #<Termin id: 10, interval_id: 6, user_id: 4, term: "2014-10-23", created_at: "2014-10-16 22:43:02", updated_at: "2014-10-16 22:43:02">, 
    #<Termin id: 11, interval_id: 6, user_id: 4, term: "2014-10-31", created_at: "2014-10-16 22:44:40", updated_at: "2014-10-16 22:44:40"> 
]

但是，當我把： Interval.first.users

[ 
#<User id: 4, email: "[email protected]", encrypted_password: "$2a$10$ChVTiXt2EjKzKYiq4GEvT.d21MuOHydJxCGxDextAYt0...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2014-10-15 22:27:44", updated_at: "2014-10-16 21:21:25", first_name: "Member", last_name: "Member", phone_number: "00000000", date_of_birth: "1989-10-16", sex: "0", role_id: 3>, 
#<User id: 4, email: "[email protected]", encrypted_password: "$2a$10$ChVTiXt2EjKzKYiq4GEvT.d21MuOHydJxCGxDextAYt0...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2014-10-15 22:27:44", updated_at: "2014-10-16 21:21:25", first_name: "Member", last_name: "Member", phone_number: "00000000", date_of_birth: "1989-10-16", sex: "0", role_id: 3>, 
#<User id: 4, email: "[email protected]", encrypted_password: "$2a$10$ChVTiXt2EjKzKYiq4GEvT.d21MuOHydJxCGxDextAYt0...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2014-10-15 22:27:44", updated_at: "2014-10-16 21:21:25", first_name: "Member", last_name: "Member", phone_number: "00000000", date_of_birth: "1989-10-16", sex: "0", role_id: 3> 
]

我想只得到最後一個查詢的1條記錄，因爲有三次相同的用戶。 歡迎任何幫助。感謝

來源

2014-10-16 zauzaj

讓它：

has_many :users, -> { uniq }, through: :termins

軌道4之前，你會使用has_many :users, through: :termins, uniq: true，但它現在已經過時及以上使用破折號，火箭是很長的路要走。

來源

2014-10-17 10:36:16 katafrakt

has_many通過在Rails中返回多個關聯的對象4

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